Clean language files

dev/translation/sanity_check_en_langfiles.php

htdocs/expensereport/tpl/linkedobjectblock.tpl.php

htdocs/langs/en_US/bookmarks.lang

htdocs/langs/en_US/boxes.lang

htdocs/langs/en_US/cashdesk.lang

htdocs/langs/en_US/categories.lang

htdocs/langs/en_US/commercial.lang

htdocs/langs/en_US/companies.lang

htdocs/langs/en_US/compta.lang

htdocs/langs/en_US/contracts.lang

htdocs/langs/en_US/cron.lang

htdocs/langs/en_US/deliveries.lang

htdocs/langs/en_US/donations.lang

htdocs/langs/en_US/ecm.lang

htdocs/langs/en_US/errors.lang

htdocs/langs/en_US/expensereports.lang

htdocs/langs/en_US/exports.lang

htdocs/langs/en_US/help.lang

htdocs/projet/card.php